June 15

1215 – King John of England signs the Magna Carta.

1752 – Benjamin Franklin proves that lightning is electricity

1776 – Delaware votes to suspend government under the British Crown and separate officially from Pennsylvania.

1804 – New Hampshire approves the Twelfth Amendment to the United States Constitution, ratifying the document.

1836 – Arkansas is admitted as the 25th U.S. state.

1846 – The Oregon Treaty extends the border between the United States and British North America, established by the Treaty of 1818, westward to the Pacific Ocean.

1849 – James K. Polk, 11th President of the United States dies at his home in Nashville Tennessee.

1864 – Arlington National Cemetery is established when 200 acres of the Arlington estate, confiscated from Robert E. Lee are set aside as a military cemetery

1916 – President Woodrow Wilson signs a bill incorporating the Boy Scouts of America

1944 – The United States invades Saipan